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Showing papers on "Boost converter published in 1975"


Proceedings ArticleDOI
09 Jun 1975
TL;DR: In this article, a continuous low-frequency, small-signal averaged model for the tapped-inductor boost converter with input filter is developed and experimentally verified, from which the dc transfer function and the small signal line input and duty ratio input describing functions can be easily derived.
Abstract: A continuous, low-frequency, small-signal averaged model for the tapped-inductor boost converter with input filter is developed and experimentally verified, from which the dc transfer function and the small-signal line input and duty ratio input describing functions can easily be derived. A new effect due to storage-time modulation in the transistor switch is shown to explain observed excess filter damping resistance without associated loss in conversion efficiency. The presence of an input filter can cause a severe disturbance, even a null, in the control duty ratio describing function, with consequent potential performance difficulties in a converter regulator.

79 citations


Patent
Herko Joseph M1, James Maurice Joyce1
20 Oct 1975
TL;DR: In this paper, an improved pulse width modulated (PWM) voltage regulator-converter system is presented, which can function alone as a switched voltage regulator system or in combination with a switched power converter.
Abstract: Disclosed herein is an improved pulse width modulated (PWM) voltage regulator-converter system which can function, alone, as a switched voltage regulator system or in combination with a switched power converter, synchronized therewith to form an improved voltage regulator-converter/power converter system. In the pulse width modulated voltage regulator-converter embodiment of the invention, secondary windings of a "current mode" regulator-converter interstage transformer are coupled to regulator-converter power transistors in a push-push circuit configuration. Signals generated by a system clock means and an error signal, derived from the output of an averaging filter, drive a pulse width modulated control means connected to the primary windings of the regulator-converter interstage transformer to thereby increase the maximum regulated output voltage of the voltage regulator-converter system after conditioning in the averaging filter. In the pulse width modulated voltage regulator-converter/power converter embodiment of the invention, the aforementioned output voltage of the voltage regulator-converter system is coupled directly to a switched power converter connected in a push-pull circuit configuration. In turn, additional signals generated by the system clock means switch the power converter in synchronizm with the voltage regulator-converter system.

54 citations


Patent
James Maurice Joyce1
20 Oct 1975
TL;DR: In this article, the authors proposed a closed-loop stability model for a voltage regulator-converter/power converter system with cascaded LC-LC filter networks, where an inductor was replaced in the averaging filter section of the voltage regulator with the primary winding of a transinductor and the secondary winding thereof was placed in series with the inductor in the output filter of the power converter.
Abstract: Instability effects over a wide range of static load current conditions in a conventional pulse width modulated (PWM) voltage regulator-converter/power converter circuit configuration having cascaded LC--LC filter networks are eliminated by replacing an inductor, in the averaging filter section of the voltage regulator-converter with the primary winding of a transinductor and by placing the secondary winding thereof in series with an inductor in the output filter section of the power converter. The aforementioned transinductor, in combination with other elements of the system, is designed and configurated such that the closed-loop stability characteristics approach that of a two pole system while maintaining the superior filtering characteristics of a four pole system.

42 citations


Patent
Earl R. Strandt1
04 Dec 1975
TL;DR: In this article, the analog voltage is stored on a capacitor and converted by an analog-to-digital converter for inputting to a computer, where switches of a keyboard are connected with a voltage divider network to establish an analog voltage for respective switch closures.
Abstract: Various switches of a keyboard are connected with a voltage divider network to establish an analog voltage for respective switch closures. The analog voltage is stored on a capacitor and converted by an analog-to-digital converter for input to a computer.

35 citations


Patent
29 May 1975
TL;DR: In this article, a regulated voltage converter utilizing an improved method of pulse width modulation is disclosed, where acceptable current balance and limiting in the converter switching elements are speedily achieved within one half cycle of converter operation.
Abstract: A regulated voltage converter utilizing an improved method of pulse width modulation is disclosed wherein acceptable current balance and limiting in the converter switching elements are speedily achieved within one half cycle of converter operation. Converter output current is monitored, shaped according to a non-linear transfer function, and integrated to form a voltage signal for comparison with a predetermined reference level. When the integrated signal exceeds the reference level, a control signal is generated to terminate the current pulse in the inverter section of the converter. The inherent balancing and limiting characteristics of this arrangement are easily extended to applications wherein multiple converter stages are paralleled to supply higher power to a common load.

35 citations


Patent
17 Oct 1975
TL;DR: In this article, a power supply capable of transferring power at high current and voltage levels to a load which may be highly inductive is presented. But the power supply includes an inverter for receiving DC power and inverting it to an AC intermediate signal.
Abstract: A power supply capable of transferring power at high current and voltage levels to a load which may be highly inductive. The power supply includes an inverter for receiving DC power and inverting it to an AC intermediate signal. The intermediate signal is rectified by a converter to provide a DC output voltage to a load. Commutation of the controlled rectifying devices within the inverter and converter are provided by capacitors connected across the output terminals of the inverter. The DC output voltage provided to the load is controlled by the frequency of the firing signals provided to the controlled rectifying devices within the inverter. A large energy storage inductor, which may be superconductive, is connected to the inverter and may be utilized to provided the pulses of power required by the load. A converter connected to an AC power system is provided to supply external power and to recharge the current flowing in the energy storage inductor. Power may be transferred reversibly, from the energy storage inductor to a load inductor and back again.

28 citations


Proceedings ArticleDOI
09 Jun 1975
TL;DR: In this paper, a linear equivalent continuous model of the power stage is established for the boost and the buck converter by means of state variable representation for each of the elementary structure occuring within one sampling period.
Abstract: Stability analysis and transient response predictions of PWM controlled DC/DC regulators are now feasible in both continuous and discontinuous mode A linear equivalent continuous model of the power stage is firstly established for the boost and the buck converter by means of state variable representation for each of the elementary structure occuring within one sampling period. This equivalent model turns out to be of first order for the discontinuous mode and of 2nd order for the continuous mode. A general computer program has been implemented for the derivation of such a model and for the stability analysis and transient response of multiloop regulators. Special emphasis has been given to the boost converter in light conduction mode operation whether an AC feedback loop is included or not. The existence of the non-minimum phase effect associated with such a regulator for a heavy operation mode is shown to be dependent of the sampling frequency.

20 citations


Proceedings ArticleDOI
J. La Duca1, R. P. Massey1
09 Jun 1975
TL;DR: In this article, three basic single-ended converter configurations are compared analytically and experimentally, and the ringing-coil converter is recommended for low power, high voltage, single output applications where low cost is essential.
Abstract: Three basic single-ended converter configurations are compared analytically and experimentally. The ringing-coil converter is recommended for low-power, high voltage, single output applications where low cost is essential. The single-ended half-wave transformer-coupled converter is recommended where the maximum output power is being squeezed for a given switching transistor power handling capability. The single-ended full-wave converter is recommended for applications with tight regulation, size, ripple and trouble voltage requirements.

10 citations


Patent
14 Apr 1975
TL;DR: In this paper, a switching control network has been used for each of the triodes and an oscillator for voltage regulation, for control of the switching phase of the diodes via the latter network.
Abstract: The control system has a switching control network which supplies the control signals for each of the triodes and an oscillator for voltage regulation, for control of the switching phase of the diodes via the latter network. The output voltage of the converter is supplied to a voltage monitor with a current monitor for the output current from the converter, and a phase monitor detects the phase difference between the output voltage signal for controlling the frequency of the voltage regulating oscillator in conjunction with a signal denoting the required power factor.

10 citations



Journal ArticleDOI
TL;DR: The technique for improving the linearity between the input voltage and the frequency of oscillation is described, accomplished by adding a control circuit to Concentional voltage-to-frequency converters.
Abstract: The technique for improving the linearity between the input voltage and the frequency of oscillation is described. This improvement is accomplished by adding a control circuit to Concentional voltage-to-frequency converters. From the experimental results, the linearity of this converter was about 0.15 percent at the frequency of 1 MHz.

Patent
Kenzo Masuda1
24 Jul 1975
TL;DR: In this paper, a frequency-voltage converter using a charge-pump element and a pulse generating circuit stabilized in frequency of the output pulse signal by using the frequency voltage converter for detecting the deviation or variation of the frequency.
Abstract: A frequency-voltage converter using a charge-pump element and a pulse generating circuit stabilized in frequency of the output pulse signal by using the frequency-voltage converter for detecting the deviation or variation of the frequency of the output pulse signal.

Patent
27 Jan 1975
TL;DR: In this article, a gate is interposed between the voltage converter and the impulse preparation device, which is connected to the converter which compares its output to an adjustable reference voltage, and the gate is closed.
Abstract: Logic circuit device and frequency voltage converter connected to the impulse preparation device. A gate being interposed between voltage converter and the impulse preparation device. Comparator connected to the converter which compares its output to an adjustable reference voltage.

Patent
Edwin Coy Ingle1
25 Apr 1975
TL;DR: In this paper, a telephone transmission line is extended by controllably inserting boost potentials into the line to series aid an applied central office battery, which is realized by sensing the direction of current flow in the line and switching a corresponding potential into the phone line.
Abstract: Transmission and signaling range of a telephone transmission line is extended by controllably inserting boost potentials into the line to series aid an applied central office battery. Insertion of the potentials is realized by sensing the direction of current flow in the line and switching a corresponding potential into the line. Optical isolators, each including a light emitting diode and phototransistor, are advantageously employed as line current sensors and switching elements. Insertion of boost potential into the line is controllably delayed in response to changes in the direction of current flow caused by apparent reversals in the polarity of the applied central office battery.

Patent
15 May 1975
TL;DR: In this article, a two-term process controller is proposed based upon an analogue channel and a digital integrating channel. But the output frequency is processed in a frequency dividing circuit with a number of pick-off output lines and the output of the frequency divider is used to change the state of a bi-directional counter coupled to a digital to analogue converter.
Abstract: A two term process controller is based upon an analogue channel and a digital integrating channel. An input voltage is fed to an analogue-to-digital converter in the form of a voltage to frequency signal converter. The output frequency is processed in a frequency dividing circuit with a number of pick-off output lines. The output of the frequency divider is used to change the state of a bi-directional counter coupled to a digital to analogue converter. Directional control of the bidirectional counter is exercised directly from the voltage to frequency converter. In the fully automatic mode of the output of the digital to analogue converter is compared with the input voltage and the difference stored in an analogue memory. For smooth change-over to the manual mode a standard frequency signal is substituted upon direction of a control circuit.


01 Feb 1975
TL;DR: In this paper, the authors examined some of the principal factors that affect the efficiency of gasoline usage by the automobile and concluded that hydrocarbons are the most effective fuels, primarily because of storage considerations.
Abstract: This article examines some of the principal factors that affect the efficiency of gasoline usage by the automobile. Since 1930 there has been an increase in the average engine compression ratio and engine operating efficiency. However, qverage vehicle fuel economy has shown a gradual decrease. This is explained by the fact that the internal combustion (ic) engine of today is designed for an operating mode that results in a degradation of thermal efficiency--engines that can supply 100 horsepower are being used, when most of today's driving situations require that the engine need supply much less than this. Also, the transmission in present vehicles attempts to match the variable engine speed to variable vehicle speed. Modern automatic transmissions are a compromise among performance, efficiency, and cost. The chemistry and hydrodynamics of flames also play a part in the efficiency of the ic engine, and there does not yet exist an acceptable theoretical model of turbulent flames or of the quench thickness of a turbulent flame impinging against a cold wall. The control of emissions of carbon monoxide, hydrocarbons, and nitrogen oxides is another factor which, with today's emission control procedures, is resulting in a loss of fuel economy. To increase fuel economy, attention is being focused on various new engines, such as the Stirling engine, the gas turbine engine, and the fuel cell. Also, new fuels are being tested. This article concludes that hydrocarbons are the most effective fuels, primarily because of storage considerations. Two general conclusions concerning the ic engine and the prospects for improving its efficiency are made. First, research and development should be directed toward improving the thermal efficiency of the Otto cycle ic engine, which presently has a 35 percent thermal efficiency. Second, research has shown that improvements in fuel economy are feasible, but engineering developments that can lead to a better fuel economy await the arrival of sufficient economic benefit to offset their initial cost.